US4570761A - Cabling structure of parking cables for drum brakes - Google Patents

Cabling structure of parking cables for drum brakes Download PDF

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Publication number
US4570761A
US4570761A US06/630,267 US63026784A US4570761A US 4570761 A US4570761 A US 4570761A US 63026784 A US63026784 A US 63026784A US 4570761 A US4570761 A US 4570761A
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United States
Prior art keywords
cable
pulley
parking
brake
cabling structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/630,267
Inventor
Takashi Inoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Akebono Brake Industry Co Ltd
Original Assignee
Akebono Brake Industry Co Ltd
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Filing date
Publication date
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Assigned to AKEBONO BRAKE INDUSTRY COMPANY LTD. reassignment AKEBONO BRAKE INDUSTRY COMPANY LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INOUE, TAKASHI
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/16Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
    • F16D51/18Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
    • F16D51/20Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
    • F16D51/22Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots mechanically actuated
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C1/00Flexible shafts; Mechanical means for transmitting movement in a flexible sheathing
    • F16C1/10Means for transmitting linear movement in a flexible sheathing, e.g. "Bowden-mechanisms"
    • F16C1/101Intermediate connectors for joining portions of split flexible shafts and/or sheathings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C1/00Flexible shafts; Mechanical means for transmitting movement in a flexible sheathing
    • F16C1/10Means for transmitting linear movement in a flexible sheathing, e.g. "Bowden-mechanisms"
    • F16C1/12Arrangements for transmitting movement to or from the flexible member
    • F16C1/18Arrangements for transmitting movement to or from the flexible member in which the end portion of the flexible member is laid along a curved surface of a pivoted member
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2361/00Apparatus or articles in engineering in general
    • F16C2361/45Brakes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00Components of actuators
    • F16D2125/18Mechanical mechanisms
    • F16D2125/58Mechanical mechanisms transmitting linear movement
    • F16D2125/60Cables or chains, e.g. Bowden cables
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00Components of actuators
    • F16D2125/18Mechanical mechanisms
    • F16D2125/58Mechanical mechanisms transmitting linear movement
    • F16D2125/60Cables or chains, e.g. Bowden cables
    • F16D2125/62Fixing arrangements therefor, e.g. cable end attachments
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/18Mechanical movements
    • Y10T74/18568Reciprocating or oscillating to or from alternating rotary
    • Y10T74/18832Reciprocating or oscillating to or from alternating rotary including flexible drive connector [e.g., belt, chain, strand, etc.]

Definitions

  • the present invention relates to a drum brake and, more particularly, to a cabling structure of a parking cable of the drum brake.
  • the structure using the bell crank has a difficulty that the lever ratio fluctuates in accordance with the swinging motions of the bell crank when the parking brake is to be applied.
  • the structure using the pulley as disclosed in U.S. Pat. No. 3,245,501, has a difficulty that the lever ratio cannot be changed because a single parking cable is wound on the pulley.
  • the present invention has an object to eliminate those difficulties by hinging a pulley to a backing plate or the like and by cabling two separate parking cables on said pulley at a changed lever ratio.
  • a cabling structure of a parking cable for a drum brake having a backing plate, a brake shoe and a parking lever comprising: a pulley hinged to swing to the backing plate or the brake shoe of said drum brake and having two arcuate grooves having different radii measured from the hinging axis thereof; and first and second cables hung in the two arcuate grooves of said pulley, respectively, and connected to a brake actuating mechanism and said parking lever, respectively, so that the direction of leading out said parking cable may be different from that of the force for pulling said parking lever without any breakage of said parking cable.
  • FIG. 1 is a front elevation showing one embodiment in which a cabling structure of a parking cable according to the present invention is applied to an internal expanding type parking brake;
  • FIG. 2 is a front elevation showing an essential portion of the same in an enlarged scale
  • FIG. 3 is a bottom view showing a pulley
  • FIG. 4 is a front elevation showing another example of the construction of the pulley
  • FIG. 5 is a bottom view showing the same
  • FIG. 6 is a front elevation showing still another example of the pulley.
  • FIG. 7 is a bottom view showing the same.
  • FIG. 1 shows one embodiment in which the cabling structure of the parking cable according to the present invention is applied to an internal expanding type parking brake.
  • reference numeral 1 indicates a backing plate; numeral 2 an anchor pin; numerals 3 and 4 brake shoes; numerals 5 and 6 shoe return springs; numeral 7 a brake shoe return spring; numeral 8 a clearance adjustor; numeral 9 a parking lever which has its one end portion hinged in a swinging manner to the brake shoe 4 by means of a pin 10; and numeral 11 a strut.
  • a parking cable 12 is divided into two portions, i.e., a first cable 12a which extends to the outside of the backing plate 1 until it is connected to a brake actuating mechanism disposed near a driver's seat, e.g., a not-shown brake lever, and a second cable which is connected to the other end portion of the parking lever 9 by means of a nipple 13.
  • a brake actuating mechanism disposed near a driver's seat
  • a second cable which is connected to the other end portion of the parking lever 9 by means of a nipple 13.
  • Indicated at numeral 14 is a sector pulley which is hinged in a swinging manner to the backing plate 1 by means of a pin 17.
  • the sector pulley 14 is formed, as shown in FIGS.
  • a sector pulley 15 is formed with a smaller arcuate groove 15a having a radius r 3 and a larger arcuate groove 15b having a radius r 4 . These arcuate grooves 15a and 15b are located in the circumference but are offset in the axial direction of the pin 17.
  • the first cable 12a is hung in the smaller groove 15a whereas the second cable 12b is hung in the larger groove 15b.
  • the ends of the individual cables 12a and 12b are retained on the side of the sector pulley 15.
  • a sector pulley 16 is formed in an identical circumference with one deep arcuate groove 16a, which has a radius r 5 on the hinging axis 17, and at its central portion with a notch 16c.
  • the cabling operation may be conducted such that the first cable 12a has its cable end retained on the end portion of the groove 16a and is hung in the groove 16a whereas the second cable 12b has its cable end retained in the notch 16c and extends with a larger radius r 6 to partially contact with the first cable 12a.
  • the direction of leading out the parking cable 12 can be changed by the pulley 14, 15 or 16, and the pulling force to be applied to the first cable 12a by actuating the not-shown brake lever acting as the brake actuating mechanism can be promptly transmitted to the second cable 12b if the ratio r 2 /r 1 , r 4 /r 3 or r 6 /r 5 is made larger than 1.
  • This pulling force can also be enlarged and transmitted to the second cable 12b if the lever ratio r 2 /r 1 , r 4 /r 3 or r 6 /r 5 is made smaller than 1.
  • the hinging point of the pulley 14, 15 and 16 by the pin 17 should not be limited to the backing plate 1 but may be located at the brake shoe 3.
  • the present invention can find wide applications such as the cabling structure of the parking cable for a leading-trailing brake equipped with the parking brake.
  • One of the practical effects is to enjoy the characteristics of the pulley such that the direction of leading out the parking cable can be changed while the input to the parking lever by the brake actuating mechanism being kept constant at all times during the actuation of the brake actuating mechanism.
  • Another effect is that the lever ratio can be suitably set by the pulley used so that the stable braking action of the parking brake can be expected by changing the force for pulling the parking lever.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Braking Arrangements (AREA)
  • Flexible Shafts (AREA)

Abstract

Herein disclosed is a cabling structure of a parking cable for a drum brake which is equipped with a backing plate, a brake shoe and a parking lever. A pulley is hinged in a swinging manner to the backing plate or the brake shoe and is formed with two arcuate grooves having different radii measured from the hinging axis. First and second cables are hung in the two arcuate grooves, respectively, and are connected to a brake actuating mechanism and the parking lever, respectively. The direction of leading out the parking cable can be different from that of the force for pulling the parking lever without any breakage of the parking cable. The pulley may alternatively be formed with one arcuate groove. Then, the second cable connected to the parking lever is retained on the pulley such that it extends to partially contact with the first cable.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a drum brake and, more particularly, to a cabling structure of a parking cable of the drum brake.
2. Description of the Prior Art
In the drum brake equipped with a parking brake of the prior art, a change of the direction of leading out the parking cable is conducted by guiding the single parking cable through a cable guide which is fixed on a backing plate or the like. This is accompanied by the slide or fold of the parking cable to cause a defect that the parking cable is liable to be broken. In view of the defect, there has been proposed a concept of changing the direction of leading out the parking cable by hinging a bell crank or a pulley to the backing plate.
However, the structure using the bell crank has a difficulty that the lever ratio fluctuates in accordance with the swinging motions of the bell crank when the parking brake is to be applied. On the other hand, the structure using the pulley, as disclosed in U.S. Pat. No. 3,245,501, has a difficulty that the lever ratio cannot be changed because a single parking cable is wound on the pulley.
SUMMARY OF THE INVENTION
In view of the difficulties of the prior art thus far described, therefore, the present invention has an object to eliminate those difficulties by hinging a pulley to a backing plate or the like and by cabling two separate parking cables on said pulley at a changed lever ratio.
According to one feature of the present invention, there is provided a cabling structure of a parking cable for a drum brake having a backing plate, a brake shoe and a parking lever, comprising: a pulley hinged to swing to the backing plate or the brake shoe of said drum brake and having two arcuate grooves having different radii measured from the hinging axis thereof; and first and second cables hung in the two arcuate grooves of said pulley, respectively, and connected to a brake actuating mechanism and said parking lever, respectively, so that the direction of leading out said parking cable may be different from that of the force for pulling said parking lever without any breakage of said parking cable.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects, features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a front elevation showing one embodiment in which a cabling structure of a parking cable according to the present invention is applied to an internal expanding type parking brake;
FIG. 2 is a front elevation showing an essential portion of the same in an enlarged scale;
FIG. 3 is a bottom view showing a pulley;
FIG. 4 is a front elevation showing another example of the construction of the pulley;
FIG. 5 is a bottom view showing the same;
FIG. 6 is a front elevation showing still another example of the pulley; and
FIG. 7 is a bottom view showing the same.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will be described in the following in connection with the embodiments thereof with reference to the accompanying drawings.
FIG. 1 shows one embodiment in which the cabling structure of the parking cable according to the present invention is applied to an internal expanding type parking brake. In FIG. 1: reference numeral 1 indicates a backing plate; numeral 2 an anchor pin; numerals 3 and 4 brake shoes; numerals 5 and 6 shoe return springs; numeral 7 a brake shoe return spring; numeral 8 a clearance adjustor; numeral 9 a parking lever which has its one end portion hinged in a swinging manner to the brake shoe 4 by means of a pin 10; and numeral 11 a strut.
A parking cable 12 is divided into two portions, i.e., a first cable 12a which extends to the outside of the backing plate 1 until it is connected to a brake actuating mechanism disposed near a driver's seat, e.g., a not-shown brake lever, and a second cable which is connected to the other end portion of the parking lever 9 by means of a nipple 13. Indicated at numeral 14 is a sector pulley which is hinged in a swinging manner to the backing plate 1 by means of a pin 17. The sector pulley 14 is formed, as shown in FIGS. 2 and 3, with two arcuate grooves 14a and 14b which are located in the same circumferential direction and which have different radii r1 and r2 measured from the hinging axis of the pin 17. In the notch 14c formed at the inner end portions of the two grooves 14a and 14b, there are retained such cable ends of the first and second cables 12a and 12b as are expanded. And, the first cable 12a is hung in the groove 14a having a smaller radius whereas the second cable 12b is hung in the groove 14b having a larger radius, thus completing the cabling operation.
The grooves of the sector pulley may be modified, as shown in FIGS. 4 and 5. A sector pulley 15 is formed with a smaller arcuate groove 15a having a radius r3 and a larger arcuate groove 15b having a radius r4. These arcuate grooves 15a and 15b are located in the circumference but are offset in the axial direction of the pin 17. The first cable 12a is hung in the smaller groove 15a whereas the second cable 12b is hung in the larger groove 15b. The ends of the individual cables 12a and 12b are retained on the side of the sector pulley 15.
In another modification, as shown in FIGS. 6 and 7, a sector pulley 16 is formed in an identical circumference with one deep arcuate groove 16a, which has a radius r5 on the hinging axis 17, and at its central portion with a notch 16c. The cabling operation may be conducted such that the first cable 12a has its cable end retained on the end portion of the groove 16a and is hung in the groove 16a whereas the second cable 12b has its cable end retained in the notch 16c and extends with a larger radius r6 to partially contact with the first cable 12a.
According to the cabling structure of the parking cable thus far described, the direction of leading out the parking cable 12 can be changed by the pulley 14, 15 or 16, and the pulling force to be applied to the first cable 12a by actuating the not-shown brake lever acting as the brake actuating mechanism can be promptly transmitted to the second cable 12b if the ratio r2 /r1, r4 /r3 or r6 /r5 is made larger than 1. This pulling force can also be enlarged and transmitted to the second cable 12b if the lever ratio r2 /r1, r4 /r3 or r6 /r5 is made smaller than 1. Incidentally, the hinging point of the pulley 14, 15 and 16 by the pin 17 should not be limited to the backing plate 1 but may be located at the brake shoe 3. Moreover, the present invention can find wide applications such as the cabling structure of the parking cable for a leading-trailing brake equipped with the parking brake.
One of the practical effects is to enjoy the characteristics of the pulley such that the direction of leading out the parking cable can be changed while the input to the parking lever by the brake actuating mechanism being kept constant at all times during the actuation of the brake actuating mechanism. Another effect is that the lever ratio can be suitably set by the pulley used so that the stable braking action of the parking brake can be expected by changing the force for pulling the parking lever.

Claims (5)

What is claimed is:
1. A cabling structure of a parking cable for a brake mechanism including a drum brake having a backing plate, a brake shoe and a parking lever, comprising:
means for increasing mechanical advantage in the cabling structure between the parking lever and the brake shoe including a pulley supported by said brake mechanism for swinging movement about an axis and having two arcuate grooves having different radii measured from said axis thereof; and
first and second independent cables slidably received in the two arcuate grooves of said pulley, respectively, and having terminal ends releasably connected to said pulley and cable portions extending to said brake actuating mechanism and said parking lever, respectively, so that the direction of leading out said parking cable may be different from the direction of leading in said parking cable to the pulley.
2. A cabling structure according to claim 1 wherein one of said grooves has an effective radius smaller than that of the other for a smaller diameter cable.
3. A cabling structure according to claim 1 wherein said two grooves are formed in a common plane.
4. A cabling structure according to claim 1 wherein said two grooves are offset from each other with respect to the direction of the axis of said pulley.
5. A cabling structure of a parking cable for a brake actuating mechanism including a drum brake having a backing plate, a brake shoe and a parking lever, comprising:
means for increasing mechanical advantage in the cabling structure between the parking lever and the brake shoe including a pulley supported by said brake mechanism for swinging movement about an axis and having a pair of concentric arcuate grooves;
a first cable connected to said brake actuating mechanism and slidably received in one of said grooves of said pulley and having a terminal end releasably connected to said pulley; and
a second cable independent from said first cable having a terminal end releasably connected to said pulley and a cable portion connected to said parking lever and retained in a second arcuate groove of said pulley such that it extends to partially contact with said first cable, so that the direction of leading out said parking cable may be different from the direction of leading in said parking cable to said pulley.
US06/630,267 1983-07-18 1984-07-12 Cabling structure of parking cables for drum brakes Expired - Lifetime US4570761A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1983110144U JPS6018336U (en) 1983-07-18 1983-07-18 Parking cable wiring structure
JP58-110144[U] 1983-07-18

Publications (1)

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US4570761A true US4570761A (en) 1986-02-18

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US06/630,267 Expired - Lifetime US4570761A (en) 1983-07-18 1984-07-12 Cabling structure of parking cables for drum brakes

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JP (1) JPS6018336U (en)
ES (1) ES8602506A1 (en)
MX (1) MX160379A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4753325A (en) * 1987-10-05 1988-06-28 Babcock Industries Inc. Parking brake assembly including automatic latching device associated with brake lever and cable, and method of connecting cable thereof
US4877346A (en) * 1988-02-01 1989-10-31 Bell & Howell Company Sheet feed hopper for insertion machine
WO2004033832A2 (en) * 2002-10-11 2004-04-22 Mecaplast Sam Device for controlling opening of motor vehicle operating sashes
US6802397B1 (en) * 1997-03-13 2004-10-12 Automotive Products Italia (Sv) Spa Automatic cable latching device for drum brake levers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6323226U (en) * 1986-07-28 1988-02-16
JP4995526B2 (en) * 2006-09-28 2012-08-08 中央発條株式会社 Stroke amplification mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2672057A (en) * 1950-03-03 1954-03-16 American Chain & Cable Co Brake operating device
US3245501A (en) * 1963-06-08 1966-04-12 Girling Ltd Actuating means for shoe drum brakes
US3292741A (en) * 1964-10-27 1966-12-20 Bendix Corp Parking mechanism for dual brake

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5857536B2 (en) * 1977-03-14 1983-12-20 セントラル硝子株式会社 Fiber aggregate manufacturing equipment
JPS5851462Y2 (en) * 1978-12-27 1983-11-24 トヨタ自動車株式会社 Parking mechanism for drum brakes
JPS5851463Y2 (en) * 1979-03-23 1983-11-24 豊生ブレ−キ工業株式会社 Parking brake device
JPS5857536U (en) * 1981-10-14 1983-04-19 川崎重工業株式会社 Motorcycle throttle opening adjustment device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2672057A (en) * 1950-03-03 1954-03-16 American Chain & Cable Co Brake operating device
US3245501A (en) * 1963-06-08 1966-04-12 Girling Ltd Actuating means for shoe drum brakes
US3292741A (en) * 1964-10-27 1966-12-20 Bendix Corp Parking mechanism for dual brake

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4753325A (en) * 1987-10-05 1988-06-28 Babcock Industries Inc. Parking brake assembly including automatic latching device associated with brake lever and cable, and method of connecting cable thereof
US4877346A (en) * 1988-02-01 1989-10-31 Bell & Howell Company Sheet feed hopper for insertion machine
US6802397B1 (en) * 1997-03-13 2004-10-12 Automotive Products Italia (Sv) Spa Automatic cable latching device for drum brake levers
WO2004033832A2 (en) * 2002-10-11 2004-04-22 Mecaplast Sam Device for controlling opening of motor vehicle operating sashes
WO2004033832A3 (en) * 2002-10-11 2004-05-13 Mecaplast Sam Device for controlling opening of motor vehicle operating sashes

Also Published As

Publication number Publication date
JPS6018336U (en) 1985-02-07
ES534395A0 (en) 1985-11-16
MX160379A (en) 1990-02-13
JPH0213782Y2 (en) 1990-04-16
ES8602506A1 (en) 1985-11-16

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